DE76311C - Device to prevent the key from being removed before the lock bolt has been advanced - Google Patents

Description

IMPERIAL

PATENT OFFICE.

CLASS 68: Locksmith.

Lock bolt.

The present invention forms devices on locks through which Care is taken that the key holding them does not come out of the lock can be pulled before the bolt is pushed forward and thus the lock is blocked is. These precautions are shown in the accompanying drawing, showing in it Fig. Ι a side view of a lock with the side of the keyhole arranged rotatable Key retaining washers. 2 and 3 show a key holder in side view and cross section with a disc rotatable around the keyhole as the center, and FIGS. 4 and 5 Finally key positions with a locking bolt arranged to the side of the keyhole operated lever.

The device Fig. 1 consists of a plate h, which is shaped round at the upper edge, is provided with two tooth-gap-like recesses at the bottom and can be rotated about a fixed axis in a bearing piece h ^1. This toothed circular plate is arranged so far to the side of the keyhole that the key engages in the left-hand recess when it is turned in the lock for the first time and turns the plate a little through tooth 1, and engages in the second recess under tooth 2 on the second turn and the plate rotates until the opposite tooth 3 rests against the bearing piece h ^l . In this position the bolt R has entered the bolt nut and the door is locked; the key can be pulled out of the lock. If the lock is now opened, the inserted key must hit the surface of tooth 2 with the key bit after the first countermovement has been carried out, press it down, then, with the second turn, lie on the rounded upper surface of the plates h and press down the tooth ι, until tooth 2 hits against h ^1. The lock is now open, but the key, prevented from turning any further by the plate h , cannot be removed from the lock.

The key can also be held in place by a sheet metal disk h, FIGS. 2 and 3, which can be rotated around the key axis as the center, which is guided in a coulisse ring η attached to the lock plate m and has a cutout K ² , which allows the key to be inserted and removed allowed.

On the sheet metal disk h there are two diametrically or almost diametrically opposite attachments h ³ / z ⁴ .

2 shows this disk h in the position which it assumes when the bolt is closed (pushed forward).

When opening, the key bit moves in the direction of the arrow and after about half a turn it takes the disc h with it through the attachment h ^a , which is also rotated when the key is turned so that the cutout / j ² moves away from the keyhole and or two turns of the key upwards, while

rend a full part of the disk h imagines the keyhole.

When closing the key bit presses by turning the key in the opposite direction against the second extension h * and turns the disk h in the opposite direction, so that when the key is turned back once or twice, the disk returns to the position shown with the cutout h " ^{1 can be brought in} front of the keyhole, whereupon the key can be withdrawn.

In Fig. 4, the key is held by a resilient lever D arranged below the bolt, one end of which is attached to the lock housing and is always pressed upwards into the position shown by the spring force inherent in it, so that its middle, upwardly curved part d ¹ partially covers the keyhole when the bolt is pushed back, whereby the key is held in the lock. ■;

When locking the lock, a thumb C attached to the locking bolt R slides along the inclined plane d ^{2 of} the lever D and pushes the lever downward so far that the keyhole is released.

This modification also means that the key can be removed from the lock even when the lock is open (i.e. with the bolt R withdrawn) by releasing the locking device, which is the case with locks for apartment doors where the key is not outside the apartment Want to leave locks stuck, should apply.

For this purpose, the free end <f ^{3 of} the lever D extends somewhat out of the lock through a slot s and is pressed downwards with a finger in the direction of the arrow to release the locking device; this also gives the stool d ^l a lower position, the keyhole becomes free and the key can be pulled out of the lock. If it is to be reinserted into the same for locking, the spring force of lever D must first be overcome by pressing the lever end d ³ and the hump rf ¹ removed from the keyhole, while after the key has been inserted into the lock and released of the end ei ³ the lever snaps back into its original position and holds the key.

However, if this release device is not to be used, the lever D is simply made a little shorter so that its end d ^A does not extend out of the lock but comes to lie within it.

This lever D but may also be arranged in such a way, that he with its inclined plane d ^'2 c on a fastened to the lock bolt R angle, Fig. 5, rests and is lifted through it at pushed back latch in the position shown, so whose DAF free At the end of d ¹ lies down in front of the key bit; This means that it cannot be turned up to the keyhole and thus the key cannot be pulled out of the lock. When moving the locking bar and thus also the angle c , the lever drops by its own weight or by the spring force inherent in the same and the keyhole BEZW. the key becomes free so that the latter can be easily pulled out of the lock.

Claims (1)

Patent claim: A device to prevent the key from being removed before the lock bolt has been advanced, consisting of levers (D) or plates (h), which are mounted on the lock housing and are moved indirectly or directly by the key when the key is closed so that they move when it is not pushed forward Either place the bolt in front of the keyhole (Figs. 2 to 4) or prevent the key bit from being turned into the position corresponding to the keyhole (Figs. 1 and 5). 1 sheet of drawings